Well Johnny, because there is not enough room to get the tior off with the brake caliper on! :dunno It's been said there are no dumb questions, but I think this prolly qualifies! As soon as I got started it was obvious the tior would not come off with the caliper on. I didn't look before I asked the question. MY Bad. Oddly enough the sensor stays put? So now I gots a matching set O TIORS :2thumbup: Battlax T30's front and rear. :riding: